Katsuo Donburi is a rice bowl dish topped with bonito flakes. To make Katsuo Donburi, you will need the following ingredients: cooked rice, bonito flakes, soy sauce, mirin, sake, ginger, garlic, green onions, and sesame seeds. First, prepare the sauce by combining soy sauce, mirin, sake, ginger, and garlic in a small saucepan. Heat the saucepan over medium heat and simmer for a few minutes until the flavors are well combined. In a separate bowl, place a serving of cooked rice and top it with bonito flakes. Pour the sauce over the rice and garnish with green onions and sesame seeds. This dish is a comforting and satisfying meal that can be enjoyed for lunch or dinner.